Question

formula of total surface Area of hollow cylinder

Answer 1

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The total surface area of a hollow cylinder is 2π ( r1 + r2 )( r2 - r1 +h), where, r1 is inner radius of cylinder, r2 is outer radius of cylinder and h is height of cylinder
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Answer 2

Surface Area of a Cylinder - AAA Math Surface Area of a Cylinder. To find the surface area of a cylinder add the surface area of each end plus the surface area of the side. Each end is a circle so the surface area of each end is π * r2, where r is the radius of the end. There are two ends so their combinded surface area is 2 π * r2.
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